R annoyances 2005-05-19 - By Uwe Ligges
Rod Montgomery wrote:
> Thomas Lumley wrote:
>
>> On Thu, 19 May 2005, Chalasani, Prasad wrote:
>>
>>> (b) When extracting 2 or more columns of a matrix,
>>> R returns the result as a matrix, BUT when extracting
>>> just one column, it returns a vector/array, rather than
>>> a matrix, so I've to keep doing as.matrix, which is annoying.
>>>
>>> sub.mtx <- as.matrix(mtx[,1])
>>>
>>> Of course I could write a suitable function
>>> cols <- function(mtx,range) as.matrix(mtx[, range])
>>> but then I lose the syntactic sugar of being able to say "[,1]".
>>
>>
>>
>> This one is actually a FAQ,
>> mtx[,1,drop=FALSE]
>>
>> -thomas
>>
> I wonder whether there is, or should be, a way to set FALSE as the default?
First question: No.
Second question: No, because *many* functions do rely on the fact that
x[,1] returns a vector rather than a matrix.
Uwe Ligges
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